Attempt Number: 5
Error Message: Action not unique compared to other actions chosen from this state before. Choose a new action

Action Reasoning:
Since the robot is holding the black color and is on tile_1-3, we should paint the tile directly below, tile_2-3, with black to match the goal state and proceed systematically.

New State Description:
Tile_0-1: clear; Tile_0-2: clear; Tile_0-3: clear; Tile_1-1: clear; Tile_1-2: clear; Tile_1-3: clear; Tile_2-1: painted black; Tile_2-2: clear; Tile_2-3: painted black. Robot1: on tile_1-3 holding color black. Color_white: available; Color_black: available.

Action Chosen:
paint-down(robot1, tile_2-3, tile_1-3, black)
